music: 60's Chart Toppers: Name The Artist: Oh Happy Day?

Questions

How many symphonies did Chopin write ?

With which composer would you link the following musical forms. Nocturnes; Etudes; Waltzes; Polonaises; Mazurkas; Impromptus etc. ?

With which composer would you link the following musical forms. Fugues; Preludes; Passions; Partitas; organ works etc. ?

Who was Wagner referring to when he said "The most stupendous miracle in all music" ?

With which composer would you link the following musical forms. Symphonies; Overtures; Choral music; piano sonatas; concertos; string quartets ?